Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WM4SG callsign genealogy
Currently held by MARTIN, WILLIAM H
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by WM4SG's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WM4SG.
No current licensee on record previously held this callsign.